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The chemical formula of mineral Atelestite is indicated by Bi8(AsO4)3(OH)5O5. This mineral is considered as a rare secondary mineral in the oxidized zone of bismuth- and arsenic-bearing mineral deposits. Mineral Atelestite is also most commonly found at its type of locality in Germany, in Saxony, at the Neuhilfe, the Weisser Hirsch, and the Junge Kalbe mines, Neustadtel-Schneeberg; as well as from Gadernheim, near Bensheim, Hesse; and the Neubulach and the Schmiedes. The name derivation of this mineral is actually not explicitly stated. Probably it was from the Greek for “incomplete,” as the composition was undetermined when the mineral was first described. Atelestite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis.Atelestite is most commonly found showing indistinct cleavage in one direction which can be found more clearly visible when viewed closely under polarizing microscope used in the field of optical mineralogy. Mineral Atelestite is most commonly found colored green, light yellow, or black in hand sample. The specific gravity measure of the mineral is usually found 6.82 grams per cubic centimeters. Most crystals of mineral Atelestite are found transparent to translucent in appearance. The hardness measure of mineral Atelestite when it is evaluated using the Mohs scale method is usually found ranging from 4.5 to 5. Atelestite is also commonly found showing adamantine to resinous luster when evaluated in reflected light of polarizing microscope used in the field of optical mineralogy. Atelestite is usually found leaving a white streak when rubbed on a white porcelain streak plate. Atelestite is also commonly found showing biaxial positive figure when viewed between crossed nicols of petrographic polarizing light microscope used in the field of optical mineralogy. Atelestite is also commonly found showing 0.0400 birefringence. Atelestite is a non-radioactive mineral as evaluated.



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Thursday, September 30th, 2010 at 3:17 pm
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Optical Mineralogy
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